I am at $3800 in parts alone in my S480 build. Still waiting on the cost of machine work like clean, magna flux, blueprint, balance and fitting the girdle. Pistons were close to $900 for Diamond with rings. Rods were a tick under $400 and still waiting on the factory forged crank to get turned.
You can review my thread "Turbo 383 in a A-body Barracuda" for a list of parts I have purchased. I am a "Bargain" shopper so I got alot of new parts cheap!!